package com.zjff.mobiletwo.text;

import java.util.HashSet;
import java.util.Set;

public class Text {
    public static void main(String[] args) {
        Set<Student> set = new HashSet<>();
        Student student = new Student();
        set.add(student);
        set.add(student);
        student = new Student();
        set.add(student);
        set.add(student);
        System.out.println(set.size());
    }
}
class Student{}
